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MQTT consumers can share and loadbalance a topic subscription.

Consumer session balancing

Sometimes consumers get overwhelmed by the number of messages they receive. VerneMQ can loadbalance between multiple consumer instances subscribed to the same topic with the same ClientId.

Enabling Session Balancing

To enable session balancing, activate the following two settings in vernemq.conf

 allow_multiple_sessions = on
 queue_deliver_mode = balance

{% hint style="info" %} Currently those settings will activate consumer session balancing globally on the respective node. Restricting balancing to specific consumers only, will require a plugin. Note that you cannot balance consumers spread over different cluster nodes. {% endhint %}